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The Tunze uses a magnet on it's side to attach it. You need the media rack to attach in the compartment. I also upgraded to the single return pump but am torn on whether I like it better than the 2 return pumps. Just seems like to much flow in a small tank for 1 return flow.

Nice start.. lookin good..

Good to have when testing this. I'm lucky I don't have it stocked yet so I can play around to see what works. Here is my graph for the past 3 days, You can see how 2 tsp slowly raised PH to 8.36.

Gotcha.. I'm just starting out, I filled the tank 2 weeks ago and added live rock and sand about a week ago. I have an Apex PH probe in the tank monitoring how the Kalk affects the system. The 1st time the ATO kicked off it ran for about 15 seconds and I didn't realize it pulled in straight...

Oh yeah I should read the title LOL!! :).. At the size I would be careful, Mine replaces about a gallon every 2 days and at a weak mix I can keep the PH at 8.3, I may take some testing to get it right.

I use the Tunze Nano 6135, I think the tubing is Standard 1/4 inch. but I have the 130D which tank do you have?

Yes I have the Tunze 9004. You need to get the media rack from In Tank but it works great and is super quiet,

Hi All I've been out of the hobby for about 6 years and decided it was time to get back at it. I found this 130D on Craigslist complete with all the upgrades, Vortech pump and Radion LEDS and could not pass it up. What a great tank way to go Red Sea. I ran vinegar through the system for a week...

I have a 130D using Kalk via the Tunze ATO. The pump runs for about 4 seconds when it turns on. Over the day it does raise the PH a couple tens of a point, but I've made my Kalk mixture weaker to adjust. I use about 1 tsp per gallon and that seems to keep things stable.